Calculate the area of a rectangle, the width of which is 5 dm and the length is 3 times greater.

Since the width of the rectangle is 5 dm and the length is three times larger, then to find out the value of the length of the rectangle, you need to multiply the width by three: 5 dm * 3 = 15 dm length of the rectangle. The area of the rectangle is: S = a * b. Substituting our values for length and width, we get: S = 5 dm * 15 dm = 75 dm sq.
Answer: the area of the rectangle is 75 dm sq.